1.6.28÷3.14÷2=11²×3.14=3.143.14+6.28×3.5=3.14+21.98=25.122.31.4÷5÷2=0.3140.314²×3.14×2+31.4
1. 6.28除以3.14除以2=1dm 6.28乘以3.5=21.98 21.98+【2*3.14*1*3.5】=21.98 ,21.98+21.98=43.96